mkl-public / testarea-itext7 Goto Github PK

  public static final String DEST = "/Users/startsi/Downloads/aaaaaaaaaa.pdf";
    public static final String SRC = "/Users/startsi/Downloads/cmp_step6_signed_by_alice_bob_carol_and_dave.pdf";

    public static void main(String[] args) throws Exception {
        new RemoveSignature().manipulatePdf3();
    }

    protected void manipulatePdf3() throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(DEST));
        String lastName = clearLastSignature(pdfDoc);
        pdfDoc.close();
    }

    String clearLastSignature(PdfDocument pdfDocument) {
        SignatureUtil signatureUtil = new SignatureUtil(pdfDocument);
        PdfAcroForm acroForm = PdfAcroForm.getAcroForm(pdfDocument, false);

        List<String> signatureNames = signatureUtil.getSignatureNames();
        if (signatureNames != null && signatureNames.size() > 0) {
            String lastSignatureName = signatureNames.get(signatureNames.size() - 1);
            PdfFormField lastSignatureField = acroForm.getField(lastSignatureName);
            if (null != lastSignatureField.getPdfObject().remove(PdfName.V))
                lastSignatureField.getPdfObject().setModified();
            for (PdfWidgetAnnotation pdfWidgetAnnotation : lastSignatureField.getWidgets()) {
                if (pdfWidgetAnnotation.getPdfObject().remove(PdfName.AP) != null)
                    pdfWidgetAnnotation.getPdfObject().setModified();
            }
            return lastSignatureName;
        }
        return null;
    }